Statistics can be used to provide additional quantitative documentation of historical writing. A variety of commercial publishers and government agencies produce statistical information on European historical topics. Examples include:
United Kingdom Annual Abstract of Statistics HSSE REF & Periodicals 314.2 G79
B.K. Mitchell. International Historical Statistics: Europe 1750-2000 HSSE REF 314 M692e 2007
Annuaire Statistique de la France HSSE REF & Periodicals 314.4 F84
Access foreign national and international government organization statistical websites and datasets HERE
Measuring Worth (University of Illinois-Chicago database providing historical and comparative price information in U.S. and Australian dollars, British pounds, and Spanish pesatas/Euros.
Oanda is a good converter of foreign currency exchange rates.